citadel/modules/smtp/serv_smtpeventclient.c

   1 /*
   2  * This module is an SMTP and ESMTP implementation for the Citadel system.
   3  * It is compliant with all of the following:
   4  *
   5  * RFC  821 - Simple Mail Transfer Protocol
   6  * RFC  876 - Survey of SMTP Implementations
   7  * RFC 1047 - Duplicate messages and SMTP
   8  * RFC 1652 - 8 bit MIME
   9  * RFC 1869 - Extended Simple Mail Transfer Protocol
  10  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  11  * RFC 2033 - Local Mail Transfer Protocol
  12  * RFC 2197 - SMTP Service Extension for Command Pipelining
  13  * RFC 2476 - Message Submission
  14  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  15  * RFC 2554 - SMTP Service Extension for Authentication
  16  * RFC 2821 - Simple Mail Transfer Protocol
  17  * RFC 2822 - Internet Message Format
  18  * RFC 2920 - SMTP Service Extension for Command Pipelining
  19  *
  20  * The VRFY and EXPN commands have been removed from this implementation
  21  * because nobody uses these commands anymore, except for spammers.
  22  *
  23  * Copyright (c) 1998-2009 by the citadel.org team
  24  *
  25  *  This program is free software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License as published by
  27  *  the Free Software Foundation; either version 3 of the License, or
  28  *  (at your option) any later version.
  29  *
  30  *  This program is distributed in the hope that it will be useful,
  31  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  *  GNU General Public License for more details.
  34  *
  35  *  You should have received a copy of the GNU General Public License
  36  *  along with this program; if not, write to the Free Software
  37  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtp_util.h"
  89 #include "event_client.h"
  90 #include "smtpqueue.h"
  91 #include "smtp_clienthandlers.h"
  92
  93 #ifdef EXPERIMENTAL_SMTP_EVENT_CLIENT
  94 const unsigned short DefaultMXPort = 25;
  95 void DeleteSmtpOutMsg(void *v)
  96 {
  97         SmtpOutMsg *Msg = v;
  98
  99         ares_free_data(Msg->AllMX);
 100         if (Msg->HostLookup.VParsedDNSReply != NULL)
 101                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 102         FreeStrBuf(&Msg->msgtext);
 103         FreeAsyncIOContents(&Msg->IO);
 104         free(Msg);
 105 }
 106
 107 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 108 eNextState SMTP_C_Timeout(AsyncIO *IO);
 109 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 110 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 111 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 112 eNextState SMTP_C_Terminate(AsyncIO *IO);
 113 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 114
 115 eNextState mx_connect_ip(AsyncIO *IO);
 116 eNextState get_one_mx_host_ip(AsyncIO *IO);
 117
 118 /******************************************************************************
 119  * So, we're finished with sending (regardless of success or failure)         *
 120  * This Message might be referenced by several Queue-Items, if we're the last,*
 121  * we need to free the memory and send bounce messages (on terminal failure)  *
 122  * else we just free our SMTP-Message struct.                                 *
 123  ******************************************************************************/
 124 void FinalizeMessageSend(SmtpOutMsg *Msg)
 125 {
 126         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 127
 128         if (DecreaseQReference(Msg->MyQItem))
 129         {
 130                 int nRemain;
 131                 StrBuf *MsgData;
 132
 133                 nRemain = CountActiveQueueEntries(Msg->MyQItem);
 134
 135                 MsgData = SerializeQueueItem(Msg->MyQItem);
 136                 /*
 137                  * Uncompleted delivery instructions remain, so delete the old
 138                  * instructions and replace with the updated ones.
 139                  */
 140                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 141                 smtpq_do_bounce(Msg->MyQItem,
 142                                 Msg->msgtext);
 143                 if (nRemain > 0) {
 144                         struct CtdlMessage *msg;
 145                         msg = malloc(sizeof(struct CtdlMessage));
 146                         memset(msg, 0, sizeof(struct CtdlMessage));
 147                         msg->cm_magic = CTDLMESSAGE_MAGIC;
 148                         msg->cm_anon_type = MES_NORMAL;
 149                         msg->cm_format_type = FMT_RFC822;
 150                         msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 151                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 152                         CtdlFreeMessage(msg);
 153                 }
 154                 else {
 155                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->MessageID, 1, "");
 156                         FreeStrBuf(&MsgData);
 157                 }
 158
 159                 RemoveQItem(Msg->MyQItem);
 160         }
 161         DeleteSmtpOutMsg(Msg);
 162 }
 163
 164 eNextState FailOneAttempt(AsyncIO *IO)
 165 {
 166         SmtpOutMsg *SendMsg = IO->Data;
 167         /*
 168          * possible ways here:
 169          * - connection timeout
 170          * -
 171          */
 172         SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 173
 174         if (SendMsg->pCurrRelay == NULL)
 175                 return eAbort;
 176         if (SendMsg->pCurrRelay->IsIP)
 177                 return mx_connect_ip(IO);
 178         else
 179                 return get_one_mx_host_ip(IO);
 180 }
 181
 182
 183 void SetConnectStatus(AsyncIO *IO)
 184 {
 185
 186         SmtpOutMsg *SendMsg = IO->Data;
 187         char buf[256];
 188         void *src;
 189
 190         buf[0] = '\0';
 191
 192         if (IO->ConnectMe->IPv6) {
 193                 src = &IO->ConnectMe->Addr.sin6_addr;
 194         }
 195         else {
 196                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 197
 198                 src = &addr->sin_addr.s_addr;
 199         }
 200
 201         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 202                   src,
 203                   buf,
 204                   sizeof(buf));
 205
 206         if (SendMsg->mx_host == NULL)
 207                 SendMsg->mx_host = "<no name>";
 208
 209         CtdlLogPrintf(CTDL_DEBUG,
 210                       "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 211                       SendMsg->n,
 212                       SendMsg->mx_host,
 213                       buf,
 214                       SendMsg->IO.ConnectMe->Port);
 215
 216         SendMsg->MyQEntry->Status = 5;
 217         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 218                      "Timeout while connecting %s [%s]:%d ",
 219                      SendMsg->mx_host,
 220                      buf,
 221                      SendMsg->IO.ConnectMe->Port);
 222 }
 223
 224 /*****************************************************************************
 225  * So we connect our Relay IP here.                                          *
 226  *****************************************************************************/
 227 eNextState mx_connect_ip(AsyncIO *IO)
 228 {
 229         SmtpOutMsg *SendMsg = IO->Data;
 230
 231         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 232
 233         IO->ConnectMe = SendMsg->pCurrRelay;
 234         /*  Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 235
 236         SetConnectStatus(IO);
 237
 238         return InitEventIO(IO, SendMsg,
 239                            SMTP_C_ConnTimeout,
 240                            SMTP_C_ReadTimeouts[0],
 241                            1);
 242 }
 243
 244 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 245 {
 246         SmtpOutMsg *SendMsg = IO->Data;
 247         struct hostent *hostent;
 248
 249         QueryCbDone(IO);
 250
 251         hostent = SendMsg->HostLookup.VParsedDNSReply;
 252         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 253             (hostent != NULL) ) {
 254                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 255                 if (SendMsg->pCurrRelay->IPv6) {
 256                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 257                                &hostent->h_addr_list[0],
 258                                sizeof(struct in6_addr));
 259
 260                         SendMsg->pCurrRelay->Addr.sin6_family = hostent->h_addrtype;
 261                         SendMsg->pCurrRelay->Addr.sin6_port   = htons(DefaultMXPort);
 262                 }
 263                 else {
 264                         struct sockaddr_in *addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 265                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 266 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 267                         memcpy(&addr->sin_addr.s_addr,
 268                                hostent->h_addr_list[0],
 269                                sizeof(uint32_t));
 270
 271                         addr->sin_family = hostent->h_addrtype;
 272                         addr->sin_port   = htons(DefaultMXPort);
 273
 274                 }
 275                 return mx_connect_ip(IO);
 276         }
 277         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 278                 return FailOneAttempt(IO);
 279 }
 280
 281 eNextState get_one_mx_host_ip(AsyncIO *IO)
 282 {
 283         SmtpOutMsg * SendMsg = IO->Data;
 284         /*
 285          * here we start with the lookup of one host. it might be...
 286          * - the relay host *sigh*
 287          * - the direct hostname if there was no mx record
 288          * - one of the mx'es
 289          */
 290
 291         InitC_ares_dns(IO);
 292
 293         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 294
 295         CtdlLogPrintf(CTDL_DEBUG,
 296                       "SMTP client[%ld]: looking up %s : %d ...\n",
 297                       SendMsg->n,
 298                       SendMsg->pCurrRelay->Host,
 299                       SendMsg->pCurrRelay->Port);
 300
 301         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 302                         SendMsg->pCurrRelay->Host,
 303                         &SendMsg->IO,
 304                         &SendMsg->HostLookup,
 305                         get_one_mx_host_ip_done))
 306         {
 307                 SendMsg->MyQEntry->Status = 5;
 308                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 309                              "No MX hosts found for <%s>", SendMsg->node);
 310                 return IO->NextState;
 311         }
 312         return IO->NextState;
 313 }
 314
 315
 316 /*****************************************************************************
 317  * here we try to find out about the MX records for our recipients.          *
 318  *****************************************************************************/
 319 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 320 {
 321         SmtpOutMsg * SendMsg = IO->Data;
 322         ParsedURL **pp;
 323
 324         QueryCbDone(IO);
 325
 326         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 327         pp = &SendMsg->Relay;
 328         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 329                 pp = &(*pp)->Next;
 330
 331         if ((IO->DNSQuery->DNSStatus == ARES_SUCCESS) &&
 332             (IO->DNSQuery->VParsedDNSReply != NULL))
 333         { /* ok, we found mx records. */
 334                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 335
 336                 SendMsg->CurrMX    = SendMsg->AllMX
 337                                    = IO->DNSQuery->VParsedDNSReply;
 338                 while (SendMsg->CurrMX) {
 339                         int i;
 340                         for (i = 0; i < 2; i++) {
 341                                 ParsedURL *p;
 342
 343                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 344                                 memset(p, 0, sizeof(ParsedURL));
 345                                 p->IsIP = 0;
 346                                 p->Port = DefaultMXPort;
 347                                 p->IPv6 = i == 1;
 348                                 p->Host = SendMsg->CurrMX->host;
 349
 350                                 *pp = p;
 351                                 pp = &p->Next;
 352                         }
 353                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 354                 }
 355                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 356         }
 357         else { /* else fall back to the plain hostname */
 358                 int i;
 359                 for (i = 0; i < 2; i++) {
 360                         ParsedURL *p;
 361
 362                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 363                         memset(p, 0, sizeof(ParsedURL));
 364                         p->IsIP = 0;
 365                         p->Port = DefaultMXPort;
 366                         p->IPv6 = i == 1;
 367                         p->Host = SendMsg->node;
 368
 369                         *pp = p;
 370                         pp = &p;
 371                 }
 372                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 373         }
 374         *pp = SendMsg->MyQItem->FallBackHost;
 375         SendMsg->pCurrRelay = SendMsg->Relay;
 376         return get_one_mx_host_ip(IO);
 377 }
 378
 379 eNextState resolve_mx_records(AsyncIO *IO)
 380 {
 381         SmtpOutMsg * SendMsg = IO->Data;
 382
 383         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 384         /* start resolving MX records here. */
 385         if (!QueueQuery(ns_t_mx,
 386                         SendMsg->node,
 387                         &SendMsg->IO,
 388                         &SendMsg->MxLookup,
 389                         smtp_resolve_mx_record_done))
 390         {
 391                 SendMsg->MyQEntry->Status = 5;
 392                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 393                              "No MX hosts found for <%s>", SendMsg->node);
 394                 return IO->NextState;
 395         }
 396         return eAbort;
 397 }
 398
 399
 400
 401 /******************************************************************************
 402  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 403  ******************************************************************************/
 404
 405 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 406                             MailQEntry *MyQEntry,
 407                             int MsgCount)
 408 {
 409         SmtpOutMsg * SendMsg;
 410
 411         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 412         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 413
 414         SendMsg->n                = MsgCount;
 415         SendMsg->MyQEntry         = MyQEntry;
 416         SendMsg->MyQItem          = MyQItem;
 417         SendMsg->pCurrRelay       = MyQItem->URL;
 418
 419         SendMsg->IO.Data          = SendMsg;
 420
 421         SendMsg->IO.SendDone      = SMTP_C_DispatchWriteDone;
 422         SendMsg->IO.ReadDone      = SMTP_C_DispatchReadDone;
 423         SendMsg->IO.Terminate     = SMTP_C_Terminate;
 424         SendMsg->IO.LineReader    = SMTP_C_ReadServerStatus;
 425         SendMsg->IO.ConnFail      = SMTP_C_ConnFail;
 426         SendMsg->IO.Timeout       = SMTP_C_Timeout;
 427         SendMsg->IO.ShutdownAbort = SMTP_C_Shutdown;
 428
 429         SendMsg->IO.SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 430         SendMsg->IO.RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 431         SendMsg->IO.IOBuf         = NewStrBuf();
 432
 433         SendMsg->IO.NextState     = eReadMessage;
 434
 435         return SendMsg;
 436 }
 437
 438 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 439                               MailQEntry *MyQEntry,
 440                               StrBuf *MsgText,
 441                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 442                               int MsgCount)
 443 {
 444         SmtpOutMsg *SendMsg;
 445
 446         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 447
 448         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 449         if (KeepMsgText) SendMsg->msgtext = MsgText;
 450         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 451
 452         if (smtp_resolve_recipients(SendMsg)) {
 453
 454
 455
 456
 457                 if (SendMsg->pCurrRelay == NULL)
 458                         QueueEventContext(&SendMsg->IO,
 459                                           resolve_mx_records);
 460                 else { /* oh... via relay host */
 461                         if (SendMsg->pCurrRelay->IsIP) {
 462                                 QueueEventContext(&SendMsg->IO,
 463                                                   mx_connect_ip);
 464                         }
 465                         else { /* uneducated admin has chosen to add DNS to the equation... */
 466                                 QueueEventContext(&SendMsg->IO,
 467                                                   get_one_mx_host_ip);
 468                         }
 469                 }
 470         }
 471         else {
 472                 /* No recipients? well fail then. */
 473                 if ((SendMsg==NULL) ||
 474                     (SendMsg->MyQEntry == NULL)) {
 475                         SendMsg->MyQEntry->Status = 5;
 476                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 477                                     HKEY("Invalid Recipient!"));
 478                 }
 479                 FinalizeMessageSend(SendMsg);
 480         }
 481 }
 482
 483
 484
 485
 486
 487
 488 /*****************************************************************************/
 489 /*                     SMTP CLIENT DISPATCHER                                */
 490 /*****************************************************************************/
 491
 492 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 493 {
 494         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 495         double Timeout;
 496         switch (NextTCPState) {
 497         case eSendReply:
 498         case eSendMore:
 499                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 500                 if (pMsg->State == eDATABody) {
 501                         /* if we're sending a huge message, we need more time. */
 502                         Timeout += StrLength(pMsg->msgtext) / 1024;
 503                 }
 504                 break;
 505         case eReadMessage:
 506                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 507                 if (pMsg->State == eDATATerminateBody) {
 508                         /*
 509                          * some mailservers take a nap before accepting the message
 510                          * content inspection and such.
 511                          */
 512                         Timeout += StrLength(pMsg->msgtext) / 1024;
 513                 }
 514                 break;
 515         case eTerminateConnection:
 516         case eAbort:
 517                 return;
 518         }
 519         SetNextTimeout(&pMsg->IO, Timeout);
 520 }
 521 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 522 {
 523         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 524         SmtpOutMsg *pMsg = IO->Data;
 525         eNextState rc;
 526
 527         rc = ReadHandlers[pMsg->State](pMsg);
 528         pMsg->State++;
 529         SMTPSetTimeout(rc, pMsg);
 530         return rc;
 531 }
 532 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 533 {
 534         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 535         SmtpOutMsg *pMsg = IO->Data;
 536         eNextState rc;
 537
 538         rc = SendHandlers[pMsg->State](pMsg);
 539         SMTPSetTimeout(rc, pMsg);
 540         return rc;
 541 }
 542
 543
 544 /*****************************************************************************/
 545 /*                     SMTP CLIENT ERROR CATCHERS                            */
 546 /*****************************************************************************/
 547 eNextState SMTP_C_Terminate(AsyncIO *IO)
 548 {
 549         SmtpOutMsg *pMsg = IO->Data;
 550
 551         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 552         FinalizeMessageSend(pMsg);
 553         return eAbort;
 554 }
 555 eNextState SMTP_C_Timeout(AsyncIO *IO)
 556 {
 557         SmtpOutMsg *pMsg = IO->Data;
 558
 559         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 560         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 561         return FailOneAttempt(IO);
 562 }
 563 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 564 {
 565         SmtpOutMsg *pMsg = IO->Data;
 566
 567         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 568         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 569         return FailOneAttempt(IO);
 570 }
 571 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 572 {
 573         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 574         SmtpOutMsg *pMsg = IO->Data;
 575
 576         pMsg->MyQEntry->Status = 3;
 577         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 578         FinalizeMessageSend(pMsg);
 579         return eAbort;
 580 }
 581
 582
 583 /**
 584  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 585  */
 586 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 587 {
 588         eReadState Finished = eBufferNotEmpty;
 589
 590         while (Finished == eBufferNotEmpty) {
 591                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 592
 593                 switch (Finished) {
 594                 case eMustReadMore: /// read new from socket...
 595                         return Finished;
 596                         break;
 597                 case eBufferNotEmpty: /* shouldn't happen... */
 598                 case eReadSuccess: /// done for now...
 599                         if (StrLength(IO->IOBuf) < 4)
 600                                 continue;
 601                         if (ChrPtr(IO->IOBuf)[3] == '-')
 602                                 Finished = eBufferNotEmpty;
 603                         else
 604                                 return Finished;
 605                         break;
 606                 case eReadFail: /// WHUT?
 607                         ///todo: shut down!
 608                         break;
 609                 }
 610         }
 611         return Finished;
 612 }
 613
 614 #endif
 615 CTDL_MODULE_INIT(smtp_eventclient)
 616 {
 617         return "smtpeventclient";
 618 }